Victor's accent was pretty thick, but other than that, this trip was fantastic. Victor used to be an environmental engineer for the park, so he knows a ton of really involved information. He took us to all of the great spots, and knew insider information that would have really thrown a wrench in things had we attempted the trip without a guide. Who knew some tunnels close for parts of the day for maintenance? He scheduled the day out perfectly to not waste any time. Worth every penny.